Re: OT: question about sizing swap for solaris

From: zhu chao <chao_ping_at_vip.163.com>
Date: Tue, 4 May 2004 14:18:32 +0800
Message-ID: <008401c4319f$a1a6f0d0$2552fc0a@corp.ebay.com>

Hi, Cary:

The explanation sounds reasonable. But does solaris use this FIFO to manage its VM? If not , more swap space should not cause hard pageout to occur more easily, right? Is there any unix that used this kind of VM management ?

To Dan Tow, your words said that if swap size is small, application will hit "out of memory", while that whitepaper on sun.com says, more swap space than needed can actually cause hard-pageout to occur more easily. There is some difference between your opinion and the paper.

And you said , from experience, you saw some application with a lot of processes swapped out to disk, without performance impact on end user, is that an oracle database server? I think that will badly impact on system performance, according to my experience(Of course my experience is much less than that of yours).

Regards
Zhu Chao.

Original Message ----- From: "Cary Millsap" <cary.millsap_at_hotsos.com> To: <oracle-l_at_freelists.org> Sent: Monday, May 03, 2004 10:14 PM Subject: RE: OT: question about sizing swap for solaris

> Another thing to think about is Belady's Anomaly. Remember that from
> Operating Systems courses? It's a demonstration of how having more
> memory can result in /more/ page faults for systems that use a
> first-in-first-out memory management policy.
>
> http://cne.gmu.edu/modules/vm/yellow/anomaly.html
>
> >

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Received on Tue May 04 2004 - 01:15:37 CDT